M 4 (NGC 6121) Globular Cluster in Scorpius
Located at: RA 16 hours 23 minutes 36 seconds, Dec -26 degrees 31 minutes 31 seconds
Size: 30'; Magnitude: 5.4; Class: 9
North is up
West to the right
| Telescope: |
8" f5 Newtonian reflector |
| Camera: |
ST-8XME, self-guided, binned 1x1, temp -15c, camera control MaxIm DL 4.53 |
| Image: |
Red (Hoya 25A) filter, 300 minutes (30 x 10 minute subs), 06/26/30 & 07/15/2006 |
| Processing: |
CCDStack 1.2, Photoshop 7.0 |
| Location: |
Rolling Roof Observatory, Thousand Oaks, CA 91360 (+34d 13m 29s -118h 52m 20s) |
| Notes: |
From the NGC / IC Project: Contemporary Visual Observation(s) for NGC 6121 NGC 6121 = M4 = E517-SC1 16 23 35.3 -26 31 32 V = 5.9; Size 26.3 17.5": very bright, very large, 15' diameter. Resolved into an extremely dense swarm of several hundred stars with many stars arranged in strings. Appears fully resolved at moderate power including the distinctive bar extending N-S through the center. M4 is possibly the closest GC at a distance of 5600 light- years. 13": excellent resolution, many star lanes. The bar through the core is resolved. 8": superb resolution of mag 11-13 stars. - by Steve Gottlieb |